The American Airlines jet collided with the US Army Blackhawk helicopter midair.
UPDATE (8:45 a.m.): Crews say 27 bodies have been recovered.
Officials also don't believe anyone survived the crash, which makes this the deadliest plane crash in the United States in almost 24 years.
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WASHINGTON D.C. - A search and rescue operation is underway after an American Airlines plane collided with a US Army Blackhawk helicopter close to Washington D.C.
The US Federal Aviation Administration says the crash happened the midair at around 9:00 p.m. last night, while the Bombardier twin-engine regional jet was trying to land at Reagan National Airport. There were 60 passengers and four crew members on the plane, while the helicopter was carrying three soldiers on a training flight.
The airport has halted all takeoffs and landings until tomorrow.
The search and rescue crews are currently scouring the waters of the Potomac River. During a press conference, Washington Mayor Mural Bowser did not say how many bodies have been recovered, but she did say "we are going to recover our fellow citizens."

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